Controller for electric drills.



W. o. DUNTLEY. CONTROLLER FOR ELECTRIC DRILLS; APPLIUATIDI PILLD SLPT '71900 Patented ma 2, 1911 I M WM ma,

m W. 0. DUNTLEY.

CONTROLLER FOR ELEGTRIG DRILLS.

Patented May 1911'.

4 sngp'rs -slmn'r 2 APPLICATION FILED SEPT. T, 1906 Patented ma 2, 19114 snrims-annnr s.

' W. 0. IJ UNTLE Y. CONTROLLER QR ELEGTBIG DRILLS.

APPLLQAI'IQN FILED s'nr'r. 1,1906.

'UNITED STATES. PATEENT OFFICE.

WILLIAM O. DUNTLEY, OF CHICAGO, ILLINOIS, ASSIGNOR T0 CHICAGO PNEUMATICTOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CONTROLLERVFOB ELECTRIC DRILLS.

Specification Letters Patent. Patented 1\f[a,y 2, 1911.

Application filed September 7., 1906. Serial No. 833,634.

To all whom it may concern:

lle it known that I, \VILLIAM 0. Down Lin, a citizen of the UnitcdStates, residinvcnted certain new and useful Improvements in Controllersfor Electric Drills,,of

which the following is a specification.

My invention relates to a controller or reliable controller of thischaracter possessing features of adrantage'and utility as will hehereinaftcr made apparent.

switch; Fig. 4 a front elevation of the switch In the drawings. Figure 1is an elevation of my new controller,orswitch shown applied to anelectric drill: Fig. 2 a sectional clcratiofrbf a portion thereof on alarger scale. showing the switch in section and a part of the drill inelevation; Fig. 3 a perspective of the ope 'ating handle of the box orcasing but showing the handle in section; Fifi. 5 a sectional elevationon the lines of Fig. 2; Fig. 6 a rear elevation of the switch box orcasing"; Fig. 7 a plan'view of a modified coi'istri'lct-ion of switch;Fig. 8

- a side elevation thereof showing the switch readily attached to anddetached froin thcj main casing of the 'dijll with ease and facility,both in the assembl ng ofythe ma-' in ofi' position and Fig. S) asimilar VIEW but, with the swdchshown in on position. ltclcrring to thepresent embodiment of my invention ashercin illustrated, the switclb orcontroller is contained within a casing 1 whiclwis adapted to he appliedand secured to one side of the main casing or shell 20f: the controller.The controller or switch is' so constructed and arranged as to be a'seltcontained or unitary structure which may be chine or for therepairing or inspectionof the controller or switch, as may be desired,

It will therefore be observedthat the con-' troller or switch isbodilyattachable to and detachable from a drillproper. Furthermore, thecontroller is provided with suitable and ellicient means wherebytheswitch proper may be readily operated by that hand of the operatorwhich holds the grasping handle marked 3 of the drill, there beings.similar grasping handle on .theopposite side of the drill casing.

Ilet'crring to the switch proper, the same is, as clearly shown in Figs;1, 2' and 5, of the novel type comprising the knife blade mg in' Ghi-ago, Cook county. Illinois, have handle, with the result i 4 adapted tocooperate with the stationary contacts 5 formingapart of anelectricalcircuit 111 which the electric motor or motors of the drill aremterposed- As shown in Fig.2, the knife blade is'in the form of a yokewhich is adapted to rock upon a sleeve 6 loosely mounted upon atransverse'shaft or arbor 7 extending transversely of the switch box or'casingl. To'this sleeve is secured a -pair of arms 8 one of which is inthe form of a bell-crank owing to the provision of an extension Sl-thereon.- Thesc arms 8 are connccted at their upper ends by-means of across pin 10 which is arranged to cooperate with a slotted or U-shapedplate 11 whose s ot engages the cross pin 10. This U- sli'apedplate ispii'otally connected to the yoke of the knife blade by means got the'cross pin or sleeve'12 arranged between the parallel arms thereof.' Bythe rocking of the-arms 8 the knife blade 4 is caused to enter betweenthe stationary contacts 5 against the tension of the spring 13, therelative movements of the parts being obsgious from an inspection ofFig. 5.

[ -Referring next to the means for actuating the switclrproper justdescribed, such operating means comprise a. handle proper 14, which1s"p1voted upon the fulcrum pm ;15 arranged between the bearing lugs'ltlextendingoutwardly from the side of the switch box or casing as clearlyshown in Figs. 2 and 4. As shown in' said figures, the

. ha ndle is normally in the oblique or angular position with respecttojthe grasping handle 3, being held in such position with a yield- "ingpressure in a manner hereinafter described. Moreover the inner-or undersur' face and in the present instance theentire handle proper is curvedto correspond with the curyature or contour of the grasping that whenthe operating-handle isdepressed for the purpose of tnrni-ngon thecnrrentto the electric motor the handle will fit, closely and snugi uponthe grasping handle. At its inner end the operating handle ismade'U-shaped by the provision of the twoparallel arms 17 one ofwhichcotiperates with an operating connection for actuating the switchproper. As herein shown, more particularly in Fig. 6, this operatin:conn'ection consists of a plunger 18 mova le vertically in a bore orcylinder formed inti. switch box or casing, such plunger being-.pivotally connected. at

"...ran

-'ated and the crank wi electric motor.;- balance the structure an a'second plun its lower end'to one of the arms 17 and at its upper end tothe arm 9, with the result that when th switch handle 14 is grasped andbrought into contact with the rasping handle 13, the switch lproper willie be turned on to the means position with a yielding ressure, I rovidearms 17. .-This plunger.-

-bore or cylinderjin theswitch boxer casing normal position,

and's movable-Q wardly inner end of such plunger and ,the upper end ofthe'borei-l It-wil thusbe-seenthat crating-handle 14 is brought inposition w operate the switch,-it is moved ainst the tension of a thespring. 20, which, 'en the gm of thegoperator on the handle 14 is releasat which time the'current is turned off the motor, Thus. the normalcondition of the motor. Leone in which the currhnt is shut 05,1116current being turned on the current turned rocked thereby.

when theoperator grasps both the handles 3 and 14,.which1' conditionismaintained so long as bothof the handles are grasped. by the operator.1 1

My invention also involves novel and efficient means for reversing theswitch so as to cause the motor to run in one direction or the other andalso to lock the switch against reversal exceptwhen the switch is'openand ofi. In the present instance the reversing and locking devices areparts of the same mechanism. -As herein shownthe reversing switchcomprises a rotatable disk 21 which is connected with the cross' shaftor arbor 7 and adapted to be This. disk is provided with contacts inthe'form of segments 22 and 23 arranged on opposite sides of the'dislr,such segments constituting the movable members or contacts which. areadapted to coiiperate with the series of four strips 24, 25- 26 anstationary contacts or of the four vcontact The relative argement ofthese partsis such that two of terminals", consistin 'theostationarycontactecboperate with the nipulation; helow I 1 ,fromt e fulcrum same.{movable contact j when the reversing switch is in one position or theother. For ..o1peratingthe reversing switch I secure to t '5 arborffianoperating lever 28 having at 2:9 for convenient ma- -end of this .0crating lever is extended hey its end a-fin er-piece oiid its axis an asa segment 30fdesigned to cooperate with a stop lu or projectionill-extending inwardly illustrated in Fig. 3. The relative arrangementof the operating lever 28 and the stop By prcierenc in orderto.

I d 'al o to provide for holding;- the handle 14 in a normal o cratinglever 28 to r 19 whic is pivots 1y connectedlatit's owerend to theother-of the, 19 is movable in a or shut-0E positio I against thetension. of-a "coiled spring 20 interposed between the restores the'parts to their.

I mechanism, the pin formed 'of'the switch handle 1 t andinaxizilnlinement ,with such handle as on l ma position shown in Figs.I, and I zvhich time the stoplu'g is in its noimal powhen the switchhandle 14 is in itsn'orof movement tion clear of the path osition toper'mit'the segment 30 and in e freely rocked n f he 31 is such that thelever can be rockeddirection or the other. To limit themovel mane thelever 2 I, provide the two t re seine 33 on opposite sides of its axis.Ih' the construction' described it is impossible' to reverse the switchat' anytime except hen the switch handle le is in'its normal h n asshownin Fig. 2', and

-moreover-- it is, impossible to operate, the

switch handle unless-the lever 28 of the re-' v'ersing'v switch is inits home tation vof the motor in one other,' 1 than these twolextremepositions, tlie.='$iyitch handle v14 could not be operated for, thereason that the consequent'upward' movement osition for reirection orthe and-prevented by thesegment B0. .,The are rangement shown not onlyassures the proper position of the switch handle 14 when the switchjsreversed,bnt also assures the pro er positioning of the 'reversin'switch mec anismfwhen the switch handFe 14 is to be operat'edJForlconvenience I will refer in the claims to the normal position as theas 7 position,- inasr'nuch as the current is at that time turned off,and tothe other position, when the switch handle is in contact with 'orin proximity to the gras ing handle, as the on position inasmuc as atthat time the current is turned on to the electric motor of the drill.

In Figs. 7, 8, and'9 ofthe drawings I have illustrated a modifiedconstruction of switc in which a lever normally held away-from If thislever should beat any other I :of the stop lug 31 would be interferedwith the grasping handle but adapted to be brought into contacttherewith by the of the operator to turn on the current, 1s op--eratively connected with the switch throu h the medium of plungersacting upon t e mechanism is inverted as compared with the positionwhich it occupies on the o0 truction hereinbefore described, but thcfirresp'o'n'ding parts in the present instance are similarly indicatedby referencecharacters. In the present instance the two plungers 84 and35 are both connected to the switch r 34 being connected to the arm 36and t e other plunger 35 to the arm 37, with the rcsult-thata third do:

the other knife blade in the mannerhereinbeforeexpl'ained.- The normalor 05., sition of the switch which is illustrated in -8 18 maintained inthe absence of positive' pressure by the operator by means of the coiledspring switch. In the present instance the switch pending arm 38 isrocked in one direction or for the purpose of actuating the I handles ofthe drill.

sition.

to opposite sides of .such casing,

that when the switchhandle is moved by the hand or by a finger of theoperator 1:01,; the position shown in Fig. 9, the lever 41'? is moved tothe position therein shown and the plun er 34; thereby depressed so asto op;

" crate the switch and to turn on the current to the electric drill.-

By preference and for convenience in opcrating, the switch handleis'providcd with a finger or hand ,piece 40 at its outer end, which isgrooved .to correspond with the curvature of the corresponding handle ofthe drill so that in operation the switch handle may be held firmly inon position by the same hand which grasps one of'the grasping It will beunderstood that when the plunger 35L is depressed to.the position shownin Fig. 9 the. other plunger 35 is caused to rise against the tension ofits spring 39'so that when the grasp of or pres sure applied by theoperator 15 released such spring will depress the plunger. 35 and l ftthe other plunger. 34: and by that act will restore the switch handle 40to normal po- I claim: a

1. In combination with an electric drill and its casing and graspinghandles secured an electric switch comprising a switch proper hav; ingterminals for making and breaking elec's. trical connection, and apivdted handle con nected with the switch proper and arranged adjacentone of the handles in position to be actuated by the operator whilegrasping such particular handle.

2. In combination with an electric drill and its casing and graspinghandles secured to opposite sides of such casing, an electricswitchcomprising a switch proper having terminals for making andbreaking elem trical connection. and a pivoted handle connected with theswitch proper and arranged adjacent. one of'the handles in position tobe brought into contact with or proximity to the grasping handle andheld by the hand of the operator in the operation of the drill.

3. In combination with an electric drill and its casing and graspinghandles secured to opposite sides of such casing, an electric switchcomprising a switch proper having terminals for making and breakingelectrical connection, and a handle connected with the switch proper andpivotedon the side of the casing adjacentthe inner end of one of thegraspmg handles and normally projecting at an angle thereto butadaptedt0.be brought theretowa-rd to operate said switch to makeelectrical connection. A v

f 4. A switch for an electric drill comprising a switch proper havingterminals for making and breaking electrical connection, a pivotedswitch handle arranged adjacent the usual grasping handle of the drilland an operating connection between the switch handle and the switchproper consisting of a plunger 18.

5. A, switch for an electric drill comprismga switch proper havlngterminals for making and breakingelectrical connection, a

pivoted switch handle arranged adjacent the usual grasping handle of thedrill, and a pair of plungers one of which is opgrativgly connected withthe switch proper.

6.-A switch for aiielectric drill comprising' a switcl1.-proper havingterminals for making and breaking electrical connection. a pivotedswitch handle arranged adjacent the usual grasping handle of the xlrill,and a pair .of parallel'plungers one ofwhich is operatively connectedwith the switch proper:

and the. other. of which is a'rranged to impart ayielding resistance-tothe switch handle.

1- 7. "A switch for an electric drill-comprising a switch proper havingterminals for inaking and breaking electrical connection, a ,pivo'ted,switch handle arranged adjacent. the

itisualgrasping handleof the drill, a pair of plungers'18 and.19. one ofwhich is operatively connected with the switch proper, and aspringcotiperating with the other plunger to i npart'a yielding resistance tothe on position of the switch handle.

S. A switch for an electric drill compris- .ing a switch proper havingterminals for making and hreakingelectrical connection. a

pivoted switch handle arranged zitljncent the V usual-grasping handle ofthe drill. and having a pair of arms 17, and a pair of plungers- "1Q'and 1.9 connected with the arms l.7, 0ne of wli ich plungers beingopera-tively connected with the switch proper.

9. A switch for. an electric drill compris ing a switch proper hayingterminals for making and breaking electrical connection, a

casing in. which the switch proper is air-- ranged and which is providedwit a Lore or cylinder, aplnnger working in said bore and operntirelyconnected with the switch proper, and a pivoted switch handle for actuating'said 'plungenr.

' l0. Aswitch for an electric drill comprising a switch proper havingterminals for making and breaking clectrical connection, a

casingin Which thc switch proper is arranged and which is provided witha pair of parallel bores or cylinders, plungers work-- ing therein, oneof which plungers being operatively connect-ed with the switch proper,and a switch handle for actuating said plu-ngers.

" 45 against movement.

' ing andhavingi 0t plungers Y :nected withthe mem cs9, and a' pivotedcasing, and a switch hen erativ'ely conne'ctilwith the switch proper,"ii-"Bprin exerting: its lte'nsion against other'o the; plungere, and aswitch handle for actuating saidplun' rs.

'- '12. A switch for an e a switch proper havin terminals 'for makingand breaking electrical connection, cnactueting member 9, a pair 18 and19* one of which is-con switch handle for actuating the plun ers.

13. A self containedjswitch for an e ectric drill comprising acasm'gadapted to be seciired thereto, a switch proper within.the d e'inthe form of a lever pivoted ppon' the casing for operating reversingswitch,

to operate the reversing switc said projection I "whereby-when thehandle and its projection is moved in the operation of turning the curthswitcn proper.

"MFA self containedswitch for ancelectric -drill comprising-a casingadapted to be socured thereto,-

casing, said casing at one a. switch proper within the side of one ofthe usual grasping handles of the drill; and a switch-handle inner 'endof the being operatively connected with the switch proper a electricdrill comprising a main switch, a

a switch handle adapted to operate the mainswitch and provided with astop projection, and a, rockin and movable in the plane of movement ofrent on to the drill the said arm is locked 16. A. controlling switchdevice for an electric drill comprising a main switch, a.

the

ectric drill compris being secured'to the drill.

handle arm adapted .p

reversing switch, a switch handle adapted to operate the main switchand-provided with -a. stop projection, and a rocking arm adapted tooperate the reversing switch and rovl'ded at one end with a segmentinovab e-in the plane ofmovement of said projection to prevent movementof the latter exceptwhen the arm is in one or the other extreme ofitspothe handle is in ,oit position. i r 17. A controlling drillcomprising a. main switch,'.a' roversi switch, a switch handle pivotednear one en and having an extension 31 projecting from an electric drillcomprisin a main switch, a revcrsin an oscilllatmg shaft or axis 7 forsun switch, reversing switch, a switch handle pivoted near one end andoperatively connected with the main switch and a rocking arm 28 securedto the shaft! for operating the reversing switch and having a portionarrange interfere with the movements of theswitch handle to preventmovement of the latter except when the reversing switch is in one or theother of its extreme positions. a

19. A switch for an electric drill comprising a switch proper havingterminals for making andbreaking electncal connection, means fornormally holding the switch in ofl position with a yielding pressure, aivoted switch handle arranged adjacent the usual grasping handle of thedrill and an op erating connection between the switch handle and theswitch proper for operating the latter against said vielding pressuremeans.

ILLIAM O. DUNTLEY.

lVitnesses: S. E.-Hmenn, Ronnn'r Donnnmran.

its pivotal axis, an operating connection be sitions and to be itselflocked except when device for-ail electric

